Via artinfo.com: NEW YORK—In federal court in Manhattan on Tuesday afternoon, New York art dealer Jack Tilton, who once represented superstar artist Marlene Dumas, offered multiple revelations regarding a blacklist that the painter has been rumored to maintain, which forbids collectors who resell her work from buying new pieces of art.

In detailed testimony, Tilton explained his knowledge about how the list was administered and revealed prominent names that were on the list, including major collectors (like Richard Cooper and Daniel Holtz), dealers (like Marc Jancou), and David Zwirner, who began representing her in 2008.